Use DrRacket to install the sicp package like this:
Open the Package Manager: in DrRacket choose the menu "File" then choose "Package Manager...".
In the tab "Do What I Mean" find the text field and enter: sicp
Finally click the "Install" button.
Test it. Make sure DrRacket has "Determine language from source" in the bottom left corner. Write the following program and click run:
The expected output is 43.